XML 87 R70.htm IDEA: XBRL DOCUMENT
v3.21.2

Note 17 - Concentration of Credit Risk (Details Textual) - USD ($) | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Cash, Uninsured Amount | $ 2,742,000 | $ 5,202,000

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant